/Engine/Source/Runtime/Engine/Public/Animation/AnimationStreaming.h
Called when an async callback is made on an async loading animation chunk request.
void OnAsyncFileCallback ( [FStreamingAnimationData](API\Runtime\Engine\Animation\FStreamingAnimationData) * StreamingAnimData, int32 ChunkIndex, int64 ReadSize, [IBulkDataIORequest](API\Runtime\CoreUObject\Serialization\IBulkDataIORequest) * ReadRequest, bool bWasCancelled )